/*
Copyright 2001-2003 The Apache Software Foundation
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package org.apache.flex.forks.batik.ext.awt.image.spi;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.StreamCorruptedException;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
import java.util.ListIterator;
import org.apache.flex.forks.batik.ext.awt.color.ICCColorSpaceExt;
import org.apache.flex.forks.batik.ext.awt.image.URLImageCache;
import org.apache.flex.forks.batik.ext.awt.image.renderable.Filter;
import org.apache.flex.forks.batik.ext.awt.image.renderable.ProfileRable;
import org.apache.flex.forks.batik.util.ParsedURL;
import org.apache.flex.forks.batik.util.Service;
/**
* This class handles the registered Image tag handlers. These are
* instances of RegisteryEntry in this package.
*
* @author <a href="mailto:Thomas.DeWeeese@Kodak.com">Thomas DeWeese</a>
* @version $Id: ImageTagRegistry.java,v 1.17 2004/08/18 07:14:15 vhardy Exp $
*/
public class ImageTagRegistry implements ErrorConstants {
List entries = new LinkedList();
List extensions = null;
List mimeTypes = null;
URLImageCache rawCache;
URLImageCache imgCache;
public ImageTagRegistry() {
this(null, null);
}
public ImageTagRegistry(URLImageCache rawCache, URLImageCache imgCache) {
if (rawCache == null)
rawCache = new URLImageCache();
if (imgCache == null)
imgCache = new URLImageCache();
this.rawCache= rawCache;
this.imgCache= imgCache;
}
public void flushCache() {
rawCache.flush();
imgCache.flush();
}
public Filter checkCache(ParsedURL purl, ICCColorSpaceExt colorSpace) {
// I just realized that this whole thing could
boolean needRawData = (colorSpace != null);
Filter ret = null;
URLImageCache cache;
if (needRawData) cache = rawCache;
else cache = imgCache;
ret = cache.request(purl);
if (ret == null) {
cache.clear(purl);
return null;
}
// System.out.println("Image came from cache" + purl);
if (colorSpace != null)
ret = new ProfileRable(ret, colorSpace);
return ret;
}
public Filter readURL(ParsedURL purl) {
return readURL(null, purl, null, true, true);
}
public Filter readURL(ParsedURL purl, ICCColorSpaceExt colorSpace) {
return readURL(null, purl, colorSpace, true, true);
}
public Filter readURL(InputStream is, ParsedURL purl,
ICCColorSpaceExt colorSpace,
boolean allowOpenStream,
boolean returnBrokenLink) {
if ((is != null) && !is.markSupported())
// Doesn't support mark so wrap with
// BufferedInputStream that does.
is = new BufferedInputStream(is);
// I just realized that this whole thing could
boolean needRawData = (colorSpace != null);
Filter ret = null;
URLImageCache cache = null;
if (purl != null) {
if (needRawData) cache = rawCache;
else cache = imgCache;
ret = cache.request(purl);
if (ret != null) {
// System.out.println("Image came from cache" + purl);
if (colorSpace != null)
ret = new ProfileRable(ret, colorSpace);
return ret;
}
}
// System.out.println("Image didn't come from cache: " + purl);
boolean openFailed = false;
List mimeTypes = getRegisteredMimeTypes();
Iterator i;
i = entries.iterator();
while (i.hasNext()) {
RegistryEntry re = (RegistryEntry)i.next();
if (re instanceof URLRegistryEntry) {
if ((purl == null) || !allowOpenStream) continue;
URLRegistryEntry ure = (URLRegistryEntry)re;
if (ure.isCompatibleURL(purl)) {
ret = ure.handleURL(purl, needRawData);
// Check if we got an image.
if (ret != null) break;
}
continue;
}
if (re instanceof StreamRegistryEntry) {
StreamRegistryEntry sre = (StreamRegistryEntry)re;
// Quick out last time the open didn't work for this
// URL so don't try again...
if (openFailed) continue;
try {
if (is == null) {
// Haven't opened the stream yet let's try.
if ((purl == null) || !allowOpenStream)
break; // No purl nothing we can do...
try {
is = purl.openStream(mimeTypes.iterator());
} catch(IOException ioe) {
// Couldn't open the stream, go to next entry.
openFailed = true;
continue;
}
if (!is.markSupported())
// Doesn't support mark so wrap with
// BufferedInputStream that does.
is = new BufferedInputStream(is);
}
if (sre.isCompatibleStream(is)) {
ret = sre.handleStream(is, purl, needRawData);
if (ret != null) break;
}
} catch (StreamCorruptedException sce) {
// Stream is messed up so setup to reopen it..
is = null;
}
continue;
}
}
if (cache != null)
cache.put(purl, ret);
if (ret == null) {
if (!returnBrokenLink)
return null;
if (openFailed)
// Technially it's possible that it's an unknown
// 'protocol that caused the open to fail but probably
// it's a bad URL...
return getBrokenLinkImage(this, ERR_URL_UNREACHABLE,
new Object[] { purl });
// We were able to get to the data we just couldn't
// make sense of it...
return getBrokenLinkImage(this, ERR_URL_UNINTERPRETABLE,
new Object[] { purl } );
}
if (ret.getProperty(BrokenLinkProvider.BROKEN_LINK_PROPERTY) != null) {
// Don't Return Broken link image unless requested
return (returnBrokenLink)?ret:null;
}
if (colorSpace != null)
ret = new ProfileRable(ret, colorSpace);
return ret;
}
public Filter readStream(InputStream is) {
return readStream(is, null);
}
public Filter readStream(InputStream is, ICCColorSpaceExt colorSpace) {
if (!is.markSupported())
// Doesn't support mark so wrap with BufferedInputStream that does.
is = new BufferedInputStream(is);
boolean needRawData = (colorSpace != null);
Filter ret = null;
Iterator i = entries.iterator();
while (i.hasNext()) {
RegistryEntry re = (RegistryEntry)i.next();
if (! (re instanceof StreamRegistryEntry))
continue;
StreamRegistryEntry sre = (StreamRegistryEntry)re;
try {
if (sre.isCompatibleStream(is)) {
ret = sre.handleStream(is, null, needRawData);
if (ret != null) break;
}
} catch (StreamCorruptedException sce) {
break;
}
}
if (ret == null)
return getBrokenLinkImage(this, ERR_STREAM_UNREADABLE, null);
if ((colorSpace != null) &&
(ret.getProperty(BrokenLinkProvider.BROKEN_LINK_PROPERTY) == null))
ret = new ProfileRable(ret, colorSpace);
return ret;
}
public synchronized void register(RegistryEntry newRE) {
float priority = newRE.getPriority();
ListIterator li;
li = entries.listIterator();
while (li.hasNext()) {
RegistryEntry re = (RegistryEntry)li.next();
if (re.getPriority() > priority) {
li.previous();
li.add(newRE);
return;
}
}
li.add(newRE);
extensions = null;
mimeTypes = null;
}
/**
* Returns a List that contains String of all the extensions that
* can be handleded by the various registered image format
* handlers.
*/
public synchronized List getRegisteredExtensions() {
if (extensions != null)
return extensions;
extensions = new LinkedList();
Iterator iter = entries.iterator();
while(iter.hasNext()) {
RegistryEntry re = (RegistryEntry)iter.next();
extensions.addAll(re.getStandardExtensions());
}
extensions = Collections.unmodifiableList(extensions);
return extensions;
}
/**
* Returns a List that contains String of all the mime types that
* can be handleded by the various registered image format
* handlers.
*/
public synchronized List getRegisteredMimeTypes() {
if (mimeTypes != null)
return mimeTypes;
mimeTypes = new LinkedList();
Iterator iter = entries.iterator();
while(iter.hasNext()) {
RegistryEntry re = (RegistryEntry)iter.next();
mimeTypes.addAll(re.getMimeTypes());
}
mimeTypes = Collections.unmodifiableList(mimeTypes);
return mimeTypes;
}
static ImageTagRegistry registry = null;
public synchronized static ImageTagRegistry getRegistry() {
if (registry != null)
return registry;
registry = new ImageTagRegistry();
registry.register(new PNGRegistryEntry());
registry.register(new TIFFRegistryEntry());
registry.register(new JPEGRegistryEntry());
registry.register(new JDKRegistryEntry());
Iterator iter = Service.providers(RegistryEntry.class);
while (iter.hasNext()) {
RegistryEntry re = (RegistryEntry)iter.next();
// System.out.println("RE: " + re);
registry.register(re);
}
return registry;
}
static BrokenLinkProvider defaultProvider
= new DefaultBrokenLinkProvider();
static BrokenLinkProvider brokenLinkProvider = null;
public synchronized static Filter
getBrokenLinkImage(Object base, String code, Object [] params) {
Filter ret = null;
if (brokenLinkProvider != null)
ret = brokenLinkProvider.getBrokenLinkImage(base, code, params);
if (ret == null)
ret = defaultProvider.getBrokenLinkImage(base, code, params);
return ret;
}
public synchronized static void
setBrokenLinkProvider(BrokenLinkProvider provider) {
brokenLinkProvider = provider;
}
}